from launch import LaunchDescription
from launch_ros.actions import Node
#封装终端指令相关类--------------
#from launch.actions import ExecuteProcess
#from launch.substitutions import FindExecutable
#参数声明与获取-----------------
#from launch.actions import DeclareLaunchArgument
#from launch.substitutions import LaunchConfiguration
#文件包含相关-------------------
#from launch.actions import IncludeLaunchDescription
#from launch.launch_description_sources import PythonLaunchDescriptionSource
#分组相关----------------------
#from launch_ros.actions import PushRosNamespace
#from launch.actions import GroupAction
#事件相关----------------------
#from launch.event_handlers import OnProcessStart,OnProcessExit
#from launch.actions import ExecuteProcess,RegisterEventHandler,LogInfo
#获取功能包下share目录路径-------
#from ament_index_python.packages import get_package_share_directory

def generate_launch_description():
    t1=Node(package="turtlesim",executable="turtlesim_node",name="t1")
    t2=Node(package="turtlesim",executable="turtlesim_node",name="t2")
    return LaunchDescription([t1,t2])